Rotate the text 90 degrees using a RotateTransform
<Window x:Class="SDKSample.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Text Transform Samples"
Background="FloralWhite"
Height="640">
<StackPanel Canvas.Left="0">
<TextBlock FontFamily="Arial Black" FontSize="64" Foreground="Moccasin" Margin ="80, 10, 0, 0">
Text Transforms
<TextBlock.RenderTransform>
<RotateTransform Angle="90" />
</TextBlock.RenderTransform>
</TextBlock>
</StackPanel>
</Window>
Related examples in the same category